Twb Wwyl H-ntyng <480p>

ROT13: t (20) → g (7) w (23) → j (10) b (2) → o (15) → "gjo"

So "wwyl" →

w (23) → j w (23) → j y (25) → l l (12) → y → "jjly" twb wwyl h-ntyng

h (8) → u n (14) → a t (20) → g y (25) → l n (14) → a g (7) → t → "uaglat" ROT13: t (20) → g (7) w (23)

Given the small size, I’ll guess it’s and the decoded phrase is: twb wwyl h-ntyng

Atbash: A=1→26=Z, B=2→25=Y, etc. Formula: new_position = 27 - old_position

Let me decode it for you: